面向边缘反走样的屏幕内容索引图自适应预测  

Edge Anti-Aliasing Oriented Adaptive Index Map Prediction of Screen Content

作　　者：宋传鸣[1,2] 刘定坤 孙诗琦 刘丹[1] SONG Chuanming;LIU Dingkun;SUN Shiqi;LIU Dan(School of Computer and Information Technology,Liaoning Nor-mal University,Dalian 116081;State Key Laboratory for Novel Software Technology,Nanjing University,Nanjing 210023)

机构地区：[1]辽宁师范大学计算机与信息技术学院,大连116081 [2]南京大学计算机软件新技术国家重点实验室,南京210023

出　　处：《模式识别与人工智能》2021年第3期253-266,共14页Pattern Recognition and Artificial Intelligence

基　　金：辽宁省自然科学基金项目(No.20180550570);辽宁省高等学校创新人才支持计划项目(No.[2018]478第64号);南京大学计算机软件新技术国家重点实验室开放课题项目(No.KFKT2018B07)资助。

摘　　要：由于边缘反走样区域的相邻索引不具备等值关系,调色板编码的预测效率有限,因此文中提出基于边缘反走样决策和多方向模板的自适应预测编码方法.引进Pitteway面积加权的边缘反走样决策,设计8个4-邻域方向预测模板.利用2D线性相关模型建模待预测索引与4个参考像素之间的相关性.采用最小二乘法为每个方向模板计算一组预测权重系数,自适应地学习显示适配器的边缘反走样算法,实现索引图预测编码.实验表明,文中方法预测准确率较高,能够增强调色板编码在边缘反走样区域和复杂边缘区域的自适应预测能力.The prediction ability of the palette coding is limited in the edge anti-aliasing regions,since the adjacent indexes do not present equivalence relation.Therefore,an adaptive predictive coding method is proposed based on edge anti-aliasing decision and multiple directional templates.Eight 4-neighbor directional prediction templates are firstly designed by introducing the Pitteway anti-aliasing decision with area weight.Subsequently,a two-dimensional linear correlation model is exploited to describe the relationship between the index to be predicted and its four reference pixels.Finally,the least square method is applied to calculate a group of weight coefficients for each directional template.The anti-aliasing algorithm executed by the display adapter is adaptively learned,and thus the predictive coding of the index map is realized.Experiments show that the proposed method achieves a higher prediction accuracy and the adaptive prediction ability of the palette coding in the anti-aliasing regions and complex edge regions is improved.

关 键 词：屏幕内容编码 调色板编码 索引图预测 多方向模板 反走样 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]